Year	Number of Firms
1997-01-01	1
2002-01-01	1
2003-01-01	3
2005-01-01	2
2006-01-01	1
2007-01-01	1
2008-01-01	3
2009-01-01	2
2010-01-01	1
2015-01-01	1
2016-01-01	1